Airflow Mode Door Actuator
WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
The airflow mode door actuator uses a cam and lever assembly to position the airflow mode doors on command from the dual-zone EATC module. The mode door actuator contains a reversible electric motor and potentiometer. The potentiometer allows the dual-zone EATC module to monitor the position of the airflow mode doors. The potentiometer circuit consists of a 5-volt reference signal connected to one end of a variable resistor, and a signal ground connected to the other. A signal return circuit is connected to a contact wiper, which is driven along the variable resistor by the actuator shaft. The signal returned to the dual-zone EATC module from the contact wiper indicates the position of the airflow mode doors.